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- Cement abstract "A cement is a binder, a substance that sets and hardens as the cement dries and also reacts with carbon dioxide in the air dependently, and can bind other materials together. The word "cement" traces to the Romans, who used the term opus caementicium to describe masonry resembling modern concrete that was made from crushed rock with burnt lime as binder. The volcanic ash and pulverized brick additives that were added to the burnt lime to obtain a hydraulic binder were later referred to as cementum, cimentum, cäment, and cement.Cements used in construction can be characterized as being either hydraulic or non-hydraulic, (see also hydraulic and non-hydraulic lime plaster).Non-hydraulic cement is prevented from setting in wet conditions or underwater, and is attacked by some aggressive chemicals after setting.Hydraulic cement is made by replacing some of the cement in a concrete mix with activated aluminium silcates, pozzolanas, such as fly ash, to activate cement setting in wet condition or underwater and further protects hardened concrete from chemical attack. (e.g., Portland cement) hardening because of hydration.The chemical process for hydraulic cement found by ancient Romans used volcanic ash (activated aluminium silicates), to activate cement hardening between the anhydrous cement powder and water or plaster and water instead of relying on water drying out and simultaeously reacting with airborn carbon dioxode.Presently cheaper, pollution free fly ash from power stations or other waste or by products are used as pozzolanas with plain cement to produce hydraulic cement.Pozzolanas can replace up to 40% of Portland cement.Thus, cement can harden underwater or when constantly exposed to wet weather. The chemical reaction results in hydrates that are not very water-soluble and so are quite durable in water and from chemical attack. Non-hydraulic cements and plasters do not harden in wet conditions.The most important uses of cement are as an ingredient in the production of mortar in masonry, and of concrete, a combination of cement and an aggregate to form a strong building material.".
- Cement thumbnail 06_Contes_cimenterie.jpg?width=300.
- Cement wikiPageExternalLink annurev.energy.26.1.303.
- Cement wikiPageExternalLink cement-structure.
- Cement wikiPageExternalLink view.php?pid=UQ:9029.
- Cement wikiPageExternalLink www.cembureau.be.
- Cement wikiPageExternalLink www.cement.org.
- Cement wikiPageExternalLink www.cementindustry.co.uk.
- Cement wikiPageExternalLink ce_pp.asp.
- Cement wikiPageExternalLink www.emccement.com.
- Cement wikiPageExternalLink 26cement.html.
- Cement wikiPageExternalLink mv_concrete.htm.
- Cement wikiPageExternalLink home1.html?lang=en.
- Cement wikiPageExternalLink www.wbcsdcement.org.
- Cement wikiPageExternalLink watch?v=0EH9AAAoO2M.
- Cement wikiPageID "6670".
- Cement wikiPageRevisionID "604172161".
- Cement hasPhotoCollection Cement.
- Cement subject Category:Building_materials.
- Cement subject Category:Cement.
- Cement subject Category:Concrete.
- Cement comment "A cement is a binder, a substance that sets and hardens as the cement dries and also reacts with carbon dioxide in the air dependently, and can bind other materials together. The word "cement" traces to the Romans, who used the term opus caementicium to describe masonry resembling modern concrete that was made from crushed rock with burnt lime as binder.".
- Cement label "Cement (bouwmateriaal)".
- Cement label "Cement".
- Cement label "Cement".
- Cement label "Cemento".
- Cement label "Cemento".
- Cement label "Ciment".
- Cement label "Cimento".
- Cement label "Zement".
- Cement label "Цемент".
- Cement label "أسمنت".
- Cement label "セメント".
- Cement label "水泥".
- Cement sameAs Cement.
- Cement sameAs Zement.
- Cement sameAs Τσιμέντο.
- Cement sameAs Cemento.
- Cement sameAs Zementu.
- Cement sameAs Ciment.
- Cement sameAs Semen.
- Cement sameAs Cemento.
- Cement sameAs セメント.
- Cement sameAs 시멘트.
- Cement sameAs Cement_(bouwmateriaal).
- Cement sameAs Cement.
- Cement sameAs Cimento.
- Cement sameAs m.01ynw.
- Cement sameAs Q45190.
- Cement sameAs Q45190.
- Cement wasDerivedFrom Cement?oldid=604172161.
- Cement depiction 06_Contes_cimenterie.jpg.
- Cement isPrimaryTopicOf Cement.